132 | DIPTERA. 
margin. Antenne black, much shorter than the face ; second joint slightly prominent ; third joint twice 
as long as the second; arista thickened at the base. Proboscis and palpi .... (retracted in the oral 
cavity). The thorax and the scutellum are sparsely covered with whitish-grey tomentum, which is most 
conspicuous on the shoulders and before the transverse suture, this part with traces of two broad black 
- bands and (between these) two black lines. Abdomen elliptical, shining black, with a narrow whitish 
front border to the second segment; the first three segments of equal length, the anal segment shorter 
and ending in a small forceps with inwardly curved branches; macrochete rather long—two dorsal ones 
on the hind margin of the first and second segments, and four on the hind margin of the third segment, 
those of the anal segment shorter and weaker. Legs black, rather robust, the posterior tibie: with several 
long bristles; foot-claws and pulvilli well developed, though not elongate. Tegule white. Wings 
grey, rather broad, rounded at the end; small cross-vein a little before the middle of the discal cell; 
apical cross-vein slightly concave; posterior cross-vein curved. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 
A single specimen, which I believe to be a female, as all the authors (even Rondani, 
who was acquainted with both sexes) are unanimous in attributing the peculiar furcate 
shape of the anus to the female sex only. 
This species differs from the European LZ. forcipata in its smaller size, in the sides of 
the front being white with some grey reflection (instead of shining black), and in the 
absence of a whitish front border to the third abdominal segment. | 
MYOBIA. 
Myobia, Robineau-Desvoidy, Essai sur les Myodaires, p. 99 (18380). 
Several species from Central America agree in almost all their characters with 
the European representatives of this genus. Many of the American species have the 
arista pubescent or even shortly pilose, thus proving their close affinity with the group 
Dexine ; more especially as they have the legs, and particularly the tarsi, more elongate 
than in the majority of the Tachinine. 
The species to be treated here may be distinguished as follows :— 
1, Abdominal segments with discal and marginal macrochete. 2. 
Abdominal segments with marginal macrochete only. . . 5. 
2. Antenne yellow. . . woe ee we wwe  flavicornis, v. d. Wulp. 
Antenne black, the basal joints sometimes more or less 
rufous 2. 6. 6 6 1 ee ee ee ee ee ee 
3. Posterior cross-vein sinuous . . .....-.. =. . succincta, v. d. Wulp. 
Posterior cross-vein straight . . . . . 2. 6 . . 2 w 4 
4, Base of the femora rufous. . . . . . . .. . . © grata,v.d. Wulp. 
Legs wholly blak . ..... . . . . seurra, v. d. Wulp. 
5. Abdomen usually with a broad blackish dorsal stripe ~. . 6. 
Abdomen without blackish dorsal stripe . . . ... . 8. 
6. Legs black. . 2. 2. 1 1. 1 we ee ew ew ew ee . Lepida, vy. d. Wulp. 
Legs rufous, or, at least, partly rufous. . . . . . . . 7%. 
